Ai Weiwei - artist, architect, curator, publisher, poet and urbanist - extended the notion of art and is one of the world's most significant creative and cultural figures. In this series of interviews, conducted over several years with the curator Hans Ulrich Obrist, he discusses the many dimensions of his artistic life, ranging over subjects including ceramics, blogging, nature, philosophy and the myriad influences that have fed into his work. He also talks candidly about his father, his childhood spent in exile and his criticism of the Chinese state. Together, these extraordinary discussions are an essential reminder of the need for personal, political and artistic freedom.